 *{
    padding: 0;
    margin: 0;
  }
  #banner{
    height: 330px;
    width: 550px;
    overflow: hidden;
    margin: 30px auto 0px;
    position: relative;
  }
  #banner ul{
    position: absolute;
    width: 999999px;
    list-style: none;
    height: 330px;
    top: 0px;
    z-index: 1;
  }
  #banner li{
    float: left;
  }
  #banner li img{
    width: 550px;
    height: 330px; 
  }
  #banner_contrl{
    position: absolute;
    bottom: 10px;
    left: 230px;
    z-index: 2;
  }
  #banner_contrl span{
    color: #fff;
    font-size: 24px;
    background: #f00;
    margin: 2px;
    border-radius: 50px;
    padding: 4px 10px;
    cursor: pointer;
  }
  #banner_contrl span:hover,
  #banner_contrl .selecting{
    background: #00f;
    color: #dedede;
  }
  #banner_contrl .leaving{
     backgrond:#f00;
     color:#fff;	 
  }